December weather in Summerset, SD
The average temperature in Summerset in December is 27.0°F (15.4°F–38.6°F). Average precipitation: 0.31 inches. Average snowfall is 5.0 inches.
December is a winter month in Summerset, and is cooler than the annual average of 46.3°F. Daily temperatures swing about 23.2°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 8h 42m. For travel, December is cold.
Avg High
38.6°F
Avg Low
15.4°F
Precipitation
0.31 in
Snow
5.0 in
December records in Summerset
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 72.0°F (1973) | -6.0°F (2025) | 0.39 in (1980) |
| December 2 | 71.1°F (2021) | -8.0°F (1980) | 0.31 in (2018) |
| December 3 | 73.9°F (2021) | -2.9°F (1978) | 0.31 in (1955) |
| December 4 | 73.0°F (1965) | -5.1°F (1972) | 0.60 in (1960) |
| December 5 | 66.0°F (1987) | -20.0°F (1972) | 0.09 in (1976) |
| December 6 | 66.0°F (1984) | -20.9°F (1972) | 0.36 in (1956) |
| December 7 | 70.0°F (1984) | -16.1°F (2013) | 0.14 in (2007) |
| December 8 | 66.0°F (2020) | -23.1°F (1972) | 0.15 in (1967) |
| December 9 | 69.1°F (1957) | -22.0°F (1972) | 0.10 in (2009) |
| December 10 | 68.0°F (2020) | -17.0°F (1972) | 0.35 in (2021) |
| December 11 | 66.0°F (1990) | -11.9°F (1989) | 0.19 in (1958) |
| December 12 | 69.1°F (2014) | -15.0°F (2000) | 0.12 in (1973) |
| December 13 | 66.0°F (2014) | -11.0°F (2000) | 0.21 in (1992) |
| December 14 | 68.0°F (2014) | -9.9°F (1963) | 0.38 in (2022) |
| December 15 | 73.0°F (1997) | -26.0°F (1989) | 0.23 in (1990) |
| December 16 | 64.9°F (1962) | -18.0°F (1979) | 0.29 in (2015) |
| December 17 | 69.1°F (1980) | -20.0°F (1964) | 0.35 in (2016) |
| December 18 | 73.9°F (1979) | -18.9°F (2016) | 0.36 in (1970) |
| December 19 | 64.0°F (1988) | -15.0°F (1989) | 0.25 in (1949) |
| December 20 | 64.9°F (1954) | -18.9°F (1990) | 0.28 in (2013) |
| December 21 | 66.0°F (1991) | -18.0°F (1990) | 0.12 in (1966) |
| December 22 | 64.0°F (2003) | -29.0°F (1989) | 0.21 in (2011) |
| December 23 | 66.9°F (1955) | -26.0°F (1989) | 0.19 in (1980) |
| December 24 | 66.9°F (1955) | -20.0°F (1990) | 0.36 in (2013) |
| December 25 | 63.0°F (1963) | -5.1°F (2008) | 0.10 in (2012) |
| December 26 | 64.9°F (2025) | -24.0°F (1996) | 0.36 in (2016) |
| December 27 | 72.0°F (1980) | -23.1°F (1996) | 0.31 in (2023) |
| December 28 | 62.1°F (1999) | -6.0°F (2012) | 0.25 in (1955) |
| December 29 | 64.9°F (1956) | -26.0°F (1990) | 0.20 in (2020) |
| December 30 | 60.1°F (1999) | -22.0°F (1968) | 0.09 in (2010) |
| December 31 | 63.0°F (1963) | -27.9°F (1990) | 0.38 in (1975) |